I'm sorry for the trouble but it seems like it has fixed itself, because I doubt that those commands gave me did anything else than diagnostics. I went through those diagnostics and noticed no message at all about a seemingly broken usb cable. The usb works fine again

. Even though, thanks alot for your effort!
The weirdest part however is that I changed nothing else but doing those diagnostics. And nothing was plugged into any usb cable.
And yes I did format the root while reinstalling (I got /, swap, /home).
Dropline is still installed since I just hate KDE, it's way too busy and bloated, but that's just my opinion
But anyway, thanks again!
Jelke